TENSION WIRE GRID SPECIFICATION
2.16 WIRE ROPE TENSION GRID
A.
Summary: System shall be one (1) system designed to provide a safe and
resilient walking surface with light-transparent properties. The wire rope
tension grid shall consist of a suspended steel frame with wire rope woven in an
over-and-under pattern to create a two (2) inch mesh. Terminate each length of
wire rope at each end along the perimeter of the framing members. Construct
hangers of 1-1/2-inch nominal diameter (1.9-inch O.D.) Schedule 80 black iron
pipe.
B.
System Description:
1.
Design Requirements: Tension grid shall be constructed so that the
maximum live load is transferred to the frame assemblies.
a.
b.
2.
Performance Requirements:
a.
b.
c.
C.
The maximum live load for the system is 15,000 lbs.
The live load on any one (1) grid hanger pipe shall not exceed 2,880
lbs.
Install tension grid system at height above finished floor as shown on
Drawings.
System shall be capable of supporting a uniform load of 20 psf with a
less than two (2) inch deflection at 250 lbs over two (2) feet.
System service life shall be concurrent with the projected life of the
building in which it is installed, dependent on appropriate use and
maintenance by the facility’s personnel.
Coordination:
1.
Coordinate with all necessary trades doing adjoining or essential work to
assure proper fit and installation for the safety of the users.
a.
b.
Grid Panels: Provide by this section including installation.
System Hangers, Sway Braces and Mounting Plates:
Specifier Note: Retain one of the subparagraphs below as appropriate to the project and delete
the others. Coordinate with Division 05 sections.
1)
2)
3)
c.
Provided by this section including installation.
Provided by Division 05 including installation.
Provided by Division 05, provided to the steel erector, and
coordinated by this section through the Construction Manager.
Lighting Pipes (Permanent or Demountable):
11060-1
Specifier Note: Retain one of the subparagraphs below as appropriate to the project and delete
the others. Coordinate with Division 05 or 26 sections.
1) Provided by this section including installation.
2) Provided by Division 05 including installation.
3) Provided by Division 26 including installation.
4) Provided by Division 26, installed by this section.
d. Handrails:
Specifier Note: Retain one of the subparagraphs below as appropriate to the project and delete
the others. Coordinate with Division 05 sections.
1)
2)
Provided by this section including installation.
Provided by Division 05 including installation.
Specifier Note: Retain the following subparagraph if required for a project. Delete if not
required.
e.
Walkway Platforms: Provided by Division 05 including installation.
Specifier Note: Retain the following subparagraph if required for a project. Delete if not
required.
f.
2.
Provide shop and as-built drawings for approval, coordination and record
as part of the system requirements.
a.
3.
4.
5.
D.
Access Bridges and Ladders: Provided by Division 05, including
installation.
Submittals shall include design calculations that have been reviewed
and signed and sealed by a Professional Structural Engineer. Include
tension grid panels, connection to hangers (whether furnished under
this section or Division 05), and connections to the structural steel.
Components, construction and installation shall allow for a minimum
design factor of eight (8).
Warrant wire rope tension grid system for a period of one (1) year
following final acceptance of the system.
Follow applicable trade standards, including basic engineering standards,
welding standards and steel construction standards.
Component Wire Rope Walking Surface:
Specifier Note: Retain one of the finishes in the following subparagraph. Mill is the standard
finish while black is optional.
11060-2
1.
2.
Each tension wire cable shall be 1/8-inch 7x19 small diameter specialty
cord impregnated with dry lubricant with breaking strength of 2,000 lbs.
[Mill] [Black] finish.
Secure ends of each length of wire rope with a factory-swaged stud and
appropriately sized NF thread stud and two (2) nuts.
a.
E.
Fittings and hardware shall conform to the wire rope manufacturer’s
recommendations. All fittings shall have 100 percent of the ultimate
cable strength.
F.
Frame: Construct from “U” shaped steel with holes appropriately drilled for
connection of wire rope.
Walk-able Checker Plates: If necessary, connect individual platforms by checker
plates fabricated from 1/4-inch steel, framed to match the elevation of the wire
rope tension grid panels. Provided and installed by Division 05.
G.
Hand Railings:
1.
H.
Lighting Positions:
1.
2.
3.
I.
Construct pipe handholds from 1-1/2 inch I.D. Schedule 40 black iron pipe.
Minimize pipe joints, if necessary. Connect using a drive fit pipe sleeve at
least 18 inches long, secured by plug welds. Attachment to uprights as
noted. Paint pipe with recognized high quality paint. Construct chain
mid-rail from 1/4-inch STCTM chain, connected to uprights with rated
shackles and eyebolts per Drawings.
Construct pipe positions from 1-1/2 inch I.D. Schedule 40 black iron pipe.
Minimize pipe joints, if necessary. Connect using a drive fit pipe sleeve at
least 18 inches long, secured by plug welds or four (4) 3/8-inch bolts and
half height Nylock nuts. Paint pipe with recognized high quality paint.
Attachment to uprights with fixed “Rota-lock” pipe clamps or approved
equal.
Attachment to uprights with swivel or rigid “Rota-lock” pipe clamps or
approved equal.
Provide quantities as indicated on Drawings and schedule.
Hanging Points:
1.
2.
3.
4.
Hang wire rope tension grid panels from support structure in an approved
method in approximately 96 inch bays, not to exceed 10 feet. Coordinate
bays and hanger locations with other trades.
Support hangers must have a 2,880 lb live load capacity.
Coordinate spacing between hangers with tension grid panels not to
exceed 10’-0” in both directions and no more than 24-inches from a wall.
Tension Grid Support Plates: 1/2-inch steel drilled for attachment of
tension grid modular panels. Weld support plates to tension grid hangers.
11060-3
5.
J.
K.
L.
Attach support plate to each tension grid panel with one (1) 1/2-inch hex
bolt, flat washers, lock washers, and hex nut in each corner.
Wire Rope Tension Grid Panel: Quantities and sizes as indicated on Drawings
and Schedules.
Paint components other than cables satin black prior to installation with
touchup in the field if necessary.
Metal work shall be free of all extraneous markings, scars and abrasion. Finish
edges smooth to the touch. Execute welds in accordance with the standards of
the American Welding Society. Welding shall be completed in a manner so as
not to add secondary stresses and create distortion.
END OF SECTION
11060-4